Seiko
Seiko's third-party supply version of the 4R35, sold to external watch brands and modders worldwide. Adds hacking and hand-winding over the 7S26 it effectively replaced. The NH35 has become the default automatic movement for watch modding and microbrand watches, thanks to its low cost, reliability, and wide availability of compatible parts including dials, hands, and cases in the Seiko-compatible format.
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Owners widely praise the San Martin 62mas Dive SN007GB for its stunning grey sunburst dial, buttery-smooth NH35 winding action, and rock-solid bezel with satisfying tactile feedback and no backplay — finishing and bracelet quality are repeatedly noted as rivaling tools at twice the price. The 39mm case feels premium and substantial, lume is bright and Seiko-comparable, and it stands out as a genuinely superior 62MAS homage that delivers vintage aesthetic at entry-level cost. Caveats include inconsistent case-back shark engraving and a misleading "SUB-0007X" designation that falsely suggests ISO 6425 diver certification; the bezel insert is glossy rather than matte, lug tips are sharp, and a few owners report bezel enamel flaking or misalignment after months of wear — male end links also make the watch wear larger than its 39mm spec suggests. Overall, owners rate the San Martin 62mas Dive SN007GB highly for its dial finishing, winding feel, and value
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